0
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1
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2 /*
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3 * Copyright (C) Igor Sysoev
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4 */
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5
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6
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7 #include <ngx_config.h>
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8 #include <ngx_core.h>
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9 #include <ngx_event.h>
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10 #include <ngx_event_connect.h>
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11
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12
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36
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13 #define NGX_RESOLVER_BUFSIZE 8192
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14
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15
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16 ngx_int_t
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17 ngx_event_connect_peer(ngx_peer_connection_t *pc)
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0
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18 {
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19 int rc;
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20 ngx_uint_t instance;
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21 u_int event;
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22 time_t now;
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23 ngx_err_t err;
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24 ngx_peer_t *peer;
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25 ngx_socket_t s;
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26 ngx_event_t *rev, *wev;
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27 ngx_connection_t *c;
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28 ngx_event_conf_t *ecf;
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29
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30 now = ngx_time();
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31
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32 /* ngx_lock_mutex(pc->peers->mutex); */
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33
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34 if (pc->peers->last_cached) {
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35
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36 /* cached connection */
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37
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38 c = pc->peers->cached[pc->peers->last_cached];
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39 pc->peers->last_cached--;
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40
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41 /* ngx_unlock_mutex(pc->peers->mutex); */
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42
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43 #if (NGX_THREADS)
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44 c->read->lock = c->read->own_lock;
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45 c->write->lock = c->write->own_lock;
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46 #endif
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47
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48 pc->connection = c;
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49 pc->cached = 1;
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50 return NGX_OK;
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51 }
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52
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53 pc->cached = 0;
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54 pc->connection = NULL;
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55
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56 if (pc->peers->number == 1) {
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28
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57 peer = &pc->peers->peer[0];
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0
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58
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59 } else {
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60
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61 /* there are several peers */
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62
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63 if (pc->tries == pc->peers->number) {
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64
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65 /* it's a first try - get a current peer */
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66
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28
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67 pc->cur_peer = pc->peers->current;
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68
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69 pc->peers->weight--;
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70
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71 if (pc->peers->weight == 0) {
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72 pc->peers->current++;
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73 }
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0
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74
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75 if (pc->peers->current >= pc->peers->number) {
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76 pc->peers->current = 0;
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77 }
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28
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78
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79 if (pc->peers->weight == 0) {
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80 pc->peers->weight = pc->peers->peer[pc->peers->current].weight;
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81 }
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0
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82 }
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83
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28
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84 for ( ;; ) {
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85 peer = &pc->peers->peer[pc->cur_peer];
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0
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86
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28
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87 if (peer->fails <= peer->max_fails) {
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88 break;
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89 }
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0
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90
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28
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91 if (now - peer->accessed > peer->fail_timeout) {
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92 peer->fails = 0;
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93 break;
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94 }
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22
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95
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28
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96 pc->cur_peer++;
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0
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97
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28
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98 if (pc->cur_peer >= pc->peers->number) {
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99 pc->cur_peer = 0;
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100 }
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0
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101
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28
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102 pc->tries--;
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0
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103
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28
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104 if (pc->tries == 0) {
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105 /* ngx_unlock_mutex(pc->peers->mutex); */
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0
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106
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28
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107 return NGX_ERROR;
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0
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108 }
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109 }
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110 }
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111
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112 /* ngx_unlock_mutex(pc->peers->mutex); */
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113
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114
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28
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115 s = ngx_socket(peer->sockaddr->sa_family, SOCK_STREAM, 0);
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0
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116
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117 if (s == -1) {
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118 ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
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119 ngx_socket_n " failed");
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120 return NGX_ERROR;
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121 }
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122
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123
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124 ecf = ngx_event_get_conf(ngx_cycle->conf_ctx, ngx_event_core_module);
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125
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126 /* disable warning: Win32 SOCKET is u_int while UNIX socket is int */
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127
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128 if ((ngx_uint_t) s >= ecf->connections) {
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129
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130 ngx_log_error(NGX_LOG_ALERT, pc->log, 0,
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131 "socket() returned socket #%d while only %d "
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132 "connections was configured, closing the socket",
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133 s, ecf->connections);
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134
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135 if (ngx_close_socket(s) == -1) {
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136 ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
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137 ngx_close_socket_n "failed");
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138 }
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139
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140 /* TODO: sleep for some time */
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141
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142 return NGX_ERROR;
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143 }
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144
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145
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146 if (pc->rcvbuf) {
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147 if (setsockopt(s, SOL_SOCKET, SO_RCVBUF,
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148 (const void *) &pc->rcvbuf, sizeof(int)) == -1) {
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149 ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
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150 "setsockopt(SO_RCVBUF) failed");
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151
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152 if (ngx_close_socket(s) == -1) {
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153 ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
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154 ngx_close_socket_n " failed");
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155 }
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156
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157 return NGX_ERROR;
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158 }
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159 }
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160
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161 if (ngx_nonblocking(s) == -1) {
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162 ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
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163 ngx_nonblocking_n " failed");
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164
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165 if (ngx_close_socket(s) == -1) {
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166 ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
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167 ngx_close_socket_n " failed");
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168 }
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169
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170 return NGX_ERROR;
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171 }
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172
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10
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173 #if (NGX_WIN32)
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32
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174
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0
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175 /*
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176 * Winsock assignes a socket number divisible by 4
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177 * so to find a connection we divide a socket number by 4.
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178 */
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179
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180 if (s % 4) {
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181 ngx_log_error(NGX_LOG_EMERG, pc->log, 0,
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182 ngx_socket_n
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183 " created socket %d, not divisible by 4", s);
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184 exit(1);
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185 }
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186
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187 c = &ngx_cycle->connections[s / 4];
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188 rev = &ngx_cycle->read_events[s / 4];
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189 wev = &ngx_cycle->write_events[s / 4];
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190
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191 #else
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192
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193 c = &ngx_cycle->connections[s];
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194 rev = &ngx_cycle->read_events[s];
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195 wev = &ngx_cycle->write_events[s];
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196
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197 #endif
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198
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199 instance = rev->instance;
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200
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201 #if (NGX_THREADS)
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202
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203 if (*(&c->lock)) {
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204 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, pc->log, 0,
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205 "spinlock in connect, fd:%d", s);
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206 ngx_spinlock(&c->lock, 1000);
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207 ngx_unlock(&c->lock);
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208 }
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209
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210 #endif
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211
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212 ngx_memzero(c, sizeof(ngx_connection_t));
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213 ngx_memzero(rev, sizeof(ngx_event_t));
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214 ngx_memzero(wev, sizeof(ngx_event_t));
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215
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216 rev->instance = !instance;
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217 wev->instance = !instance;
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218
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219 rev->index = NGX_INVALID_INDEX;
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220 wev->index = NGX_INVALID_INDEX;
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221
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222 rev->data = c;
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223 wev->data = c;
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224
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225 c->read = rev;
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226 c->write = wev;
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227 wev->write = 1;
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228
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229 c->log = pc->log;
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230 rev->log = pc->log;
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231 wev->log = pc->log;
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232
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233 c->fd = s;
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234
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235 c->log_error = pc->log_error;
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236
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32
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237 if (peer->sockaddr->sa_family != AF_INET) {
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238 c->tcp_nopush = NGX_TCP_NOPUSH_DISABLED;
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239 c->tcp_nodelay = NGX_TCP_NODELAY_DISABLED;
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240 }
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241
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0
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242 pc->connection = c;
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243
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244 /*
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245 * TODO: MT: - atomic increment (x86: lock xadd)
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246 * or protection by critical section or mutex
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247 *
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248 * TODO: MP: - allocated in a shared memory
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249 * - atomic increment (x86: lock xadd)
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250 * or protection by critical section or mutex
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251 */
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252
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253 c->number = ngx_atomic_inc(ngx_connection_counter);
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254
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255 #if (NGX_THREADS)
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256 rev->lock = pc->lock;
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257 wev->lock = pc->lock;
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258 rev->own_lock = &c->lock;
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259 wev->own_lock = &c->lock;
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260 #endif
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261
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262 if (ngx_add_conn) {
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263 if (ngx_add_conn(c) == NGX_ERROR) {
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264 return NGX_ERROR;
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265 }
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266 }
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267
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268 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, pc->log, 0,
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269 "connect to %V, #%d", &peer->name, c->number);
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270
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271 rc = connect(s, peer->sockaddr, peer->socklen);
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0
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272
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273 if (rc == -1) {
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274 err = ngx_socket_errno;
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275
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276 /* Winsock returns WSAEWOULDBLOCK (NGX_EAGAIN) */
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277
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278 if (err != NGX_EINPROGRESS && err != NGX_EAGAIN) {
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279 ngx_connection_error(c, err, "connect() failed");
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280
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36
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281 #if 0
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282 #undef sun
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283 {
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284 struct sockaddr_un *sun;
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285
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286 sun = (struct sockaddr_un *) peer->sockaddr;
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287
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288 ngx_log_error(NGX_LOG_ALERT, pc->log, 0,
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289 "\"%s\", f:%d, l:%uz",
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290 sun->sun_path, sun->sun_family, peer->socklen);
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0
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291 }
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36
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292 #endif
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0
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293
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294 return NGX_CONNECT_ERROR;
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295 }
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296 }
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297
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298 if (ngx_add_conn) {
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299 if (rc == -1) {
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36
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300
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0
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301 /* NGX_EINPROGRESS */
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36
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302
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0
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303 return NGX_AGAIN;
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304 }
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305
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306 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, pc->log, 0, "connected");
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32
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307
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308 wev->ready = 1;
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309
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0
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310 return NGX_OK;
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311 }
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312
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313 if (ngx_event_flags & NGX_USE_AIO_EVENT) {
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314
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4
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315 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, pc->log, ngx_socket_errno,
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316 "connect(): %d", rc);
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317
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0
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318 /* aio, iocp */
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319
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320 if (ngx_blocking(s) == -1) {
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321 ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
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322 ngx_blocking_n " failed");
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323 return NGX_ERROR;
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324 }
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325
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326 /*
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327 * FreeBSD's aio allows to post an operation on non-connected socket.
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328 * NT does not support it.
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329 *
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330 * TODO: check in Win32, etc. As workaround we can use NGX_ONESHOT_EVENT
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331 */
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332
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333 rev->ready = 1;
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334 wev->ready = 1;
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335
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336 return NGX_OK;
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337 }
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338
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339 if (ngx_event_flags & NGX_USE_CLEAR_EVENT) {
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340
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341 /* kqueue */
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342
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0
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343 event = NGX_CLEAR_EVENT;
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344
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36
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345 } else {
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346
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347 /* select, poll, /dev/poll */
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348
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0
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349 event = NGX_LEVEL_EVENT;
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350 }
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351
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352 if (ngx_add_event(rev, NGX_READ_EVENT, event) != NGX_OK) {
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353 return NGX_ERROR;
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354 }
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355
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356 if (rc == -1) {
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357
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358 /* NGX_EINPROGRESS */
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359
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360 if (ngx_add_event(wev, NGX_WRITE_EVENT, event) != NGX_OK) {
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361 return NGX_ERROR;
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362 }
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363
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364 return NGX_AGAIN;
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365 }
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366
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367 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, pc->log, 0, "connected");
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368
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369 wev->ready = 1;
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370
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371 return NGX_OK;
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372 }
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373
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374
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36
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375 void
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376 ngx_event_connect_peer_failed(ngx_peer_connection_t *pc)
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0
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377 {
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378 time_t now;
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379
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380 now = ngx_time();
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381
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382 /* ngx_lock_mutex(pc->peers->mutex); */
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383
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28
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384 pc->peers->peer[pc->cur_peer].fails++;
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385 pc->peers->peer[pc->cur_peer].accessed = now;
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0
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386
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387 /* ngx_unlock_mutex(pc->peers->mutex); */
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388
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389 pc->cur_peer++;
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390
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391 if (pc->cur_peer >= pc->peers->number) {
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392 pc->cur_peer = 0;
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393 }
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394
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395 pc->tries--;
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396 }
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